Flexible active device array substrate and organic electroluminescent device having the same

Abstract

A flexible active device array substrate including a flexible substrate, an active device array layer, a barrier layer, and a plurality of pixel electrodes is provided. The active device array layer is disposed on the flexible substrate. The barrier layer covers the active device array layer. The barrier layer includes a plurality of organic material layers and a plurality of inorganic material layers. The organic material layers and the inorganic material layers are alternately stacked on the active device array layer. The pixel electrodes are disposed on the barrier layer, and each of the pixel electrodes is electrically connected to the active device array layer.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims the priority benefit of Taiwan application serial no. 100142005, filed on Nov. 17, 2011. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The application relates to an active device array substrate, and in particular to a flexible active device array substrate.[0004]2. Description of Related Art[0005]Organic electroluminescent devices have been considered a dominant flat panel display in the future because of their desirable qualities of compactness, self-luminescence, low power consumption, no need of backlight source, no viewing angle limitation, and high response speed. To be able to broadly apply the organic electroluminescent device, a flexible organic electroluminescent device has been developed. Whether a display is flexible is determined by a material of a sub...

AI Technical Summary

Benefits of technology

This patent describes a flexible device with good reliability. It uses an organic electroluminescent device with alternating layers of organic and inorganic materials. The invention also includes an integrated barrier layer that improves reliability. The flexible device has low WVTR (water vapor transmission rate) and is flexible.

Problems solved by technology

Nonetheless, in the process of fabricating a flexible organic electroluminescent device, the unfavorable flexibility of the inorganic material may cause cracks in the passivation layer after the TFT is bent.

Thereby, water vapor (humidity) penetrates the passivation layer through the cracks and thus affects the electrical properties of the TFT.

However, water resistance of the organic material is not as good as that of the inorganic material, and accordingly water vapor (humidity) is apt to penetrate the TFT and thereby affects the electrical properties of the TFT.

In comparison with the common rigid substrate (e.g., a glass substrate), when a flexible substrate applied is made of plastic, water vapor (humidity) is prone to penetrate the TFT through a direction of the plastic substrate, thus posing an impact on the electrical properties of the TFT.

As a result, how to improve the reliability of a flexible active device array substrate is one of the issues to be resolved imminently.

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